Pull-socket.



H. HUBBELL.

PULL SOCKET.

APPLIGATION FILED MAY e, 1912.

1,053,177. y Patented Feb. 18, 1913.

w/mfssfs.' 33 llvvf/voff MMM 24 y */WMM LU. l? By Y A TTOR/VEY the shell for limiting the movement of the to reduce the number HARVEY nUBBnLI., or niainenroar. CONNECTICUT.

PULL-SOKET.

' Specification of Letters Patent.

Patented Feb. 18,1913.

Application filed May 6*, 1912. Serial No. 695,473.

To all whom t may concern:

Be it known -that I HARVEY HUBBELL, a citizen of the United States, residing at Bridgeport, county of Faireld, State of Connecticut, have inventedv an Improvement in Pull-Sockets, of which the following is a specification.

This invention relates to pull sockets for incandescent electric lamps Vand has foi-.its general objects to simplify the construction, y ofparts and the cost of construction, and to so 'greatly improve the operation in use that danger of the mechanism getting out of order i's practically eliminated. i A further object of the invention is to l produce afpull socket so constructed as to permit the" use of a relatively small shell with switch mechanism -amplylarge to 'meet the requirements of use and with a large.,

clearance between the A switch mechanisml and the current carrying brackets, which is accomplished by placing the switch mecha-y nisin eccentrically and on the far side from the operating mechanism.

A further object of the invention is tol produce a pull socket in which, in lieu ofv a chain, the pulling member shall be a direct acting bar pivoted to the operating member, thus doing away with the part. most likely to break and which is a frequent causeA of trouble inpull sockets as ordial part narily constructed.

A further object of the invention vis t0- provide a novel. insulating operating wheel y which the switch mechanism is perfectly insulated fromthe operating mechanism.

.A further and very important object of the invention is to provide means within operating mechanism whereby the switch is fully relieved from the shocks ofthe pulls, the delicate mechanism of the switch sing subjected to no strain whatever eX- 'cept to overcome the action of the operat ing spring'.` With these and other objects in`- view, the invention consists in certain constructions and in certain parts, improvements and ccmbinations which will be hereina r described and then specifically (pointed out in e the accompan 'n drawin s .of this speciylicga'tion,` g

y Figure 1 is 'a plan view to the insulating blocks forming the lower insulating blockyth'e current carrying brackets being in section; Fig. 2, anelevation of the insulating blocks and switch mechanism, with the shell in section; Fig. 3, a view partly in section of the switch -mechanism and insulatir blocks detached; Fig. 4, a plan view of t e contact plate, detached; Fig. 5, a plan view of the operating member and operating bar detached, the hub being in section and the parts in the operated position; Fig. 6, an

edge view of the insulating operating mem- A 1 ber and the operating bar; Fig. 7, an inverted plan view of the operating member detached; and Fig. 8 is a plan view of the switch mechanism and lower insulating block, the operating member and ating bar being in the normal position.

10 denotes the socket shell, l1 the cap,

the oper- 12 the insulating lining, 1.3 the screw shell, 75

14 and 15V insulating blocks, which I term for convenience the upper and lower insulating blocks, respectively, and 16 and 17 current carrying brackets by which the insulating blocks are connected. The lower insulating block is'provided with inclines -18 which terminate with abrupt shoulders,

alternate incline's carrying plates 19 which are inthe circuit.

20 ydenotes the contact novel operating member, both of which are plate and 21 my 85 adapted to turn freely on apin 22. The`- contact plateis' provided with spring arms 23 which engage the inclines and is itself engaged and operated byV the operating member, oscillation of tary4 movement of the contact plate. The operating member comprises a lower plate 24, an upper plate 25 and an intermediate which produces roplate 26, all three made of'insulating'i'nate- 95 rial, and under the lower plate a metal plate 27, shown as provided with 'integral lugsA 28 which pass ,through the plates of insulating material and secure the four plates together s 29, denotes a bearing tube for theoperating member which is struck out from the metal of plate 27.` Upon the-lower side of plate 27 are teeth or lugsv 30r which are adapted to` engage the contact Aplate to actu ate said plate."`

31 denotes a spring `which returns the operating member to its'normal position `after each actuation, one end of saidspring being connected to the pin and the'other te the operating member. The tension ofthe oper4 tumin g the pin, the spring additionally acting to hold the angular head of, the pin in a socket in the upper insulating block which retains it against rotation.

Fuller description of the operation of the switch is not thought to be required as it has been illustrated, described and claimed in various patents heretofore granted to me.

A vitally important feature Aof the-present invention is the arrangement of the switch mechanism with relation to the insulating blocks, the current carrying brackets and the operating mechanism. l It is desirable that the parts be as small and the arrangement as compactas possible in order l to reduce the sizeof the shell, as the trade will not take large and clumsy pull sockets, but the switch mechanism must ofcourse be large enough to provide ample current carrying capacity. kIt is furthermore essential in the present structure that the operative parts be arranged to work in the horizontal plane Aand that the parts of the switch be placed at a safe distance from the current carrying brackets; that is far enough away to make short circuiting impossible and also important to do away with the use of a chain within the shell and to provide a direct pull upon the operating member. These different requirements I have found it impossible to work out with a horizontally operating switch arranged centrally of the shell as heretofore. I have, however, succeeded in overcoming all of the difliculties and in providing a switch which fully meets the requirements stated, by placing the switch eccentrically to the insulating blocks and on the far side of the blocks from Vthe operating mechanism. This requires the use of arelatively long operating bar which has relatively little swing, its operation beinga direct pull and practically tangential to the arc of movement of the pivotal point of the operating bar to the operating member. It will of course be obvious that the greater the diameter of the switch the greater will be the swing of the operating bar and the nearer the switch is placed to the operating mechanism the more it will be necessary to shorten the operating bar and the greater will be its swing.

' In the drawings I have illustrated an arrangement of the parts that I have found to work out perfectly in practice. The current carrying brackets are placed diametri cally opposite to each other and the operating mechanism is placed midway between them. This exact arrangement, however, is not essential. It is essential, however, that the switch be located eccentrically to. the insulating blocks and on the side opposite to the operating mechanism. In the present instance while the switch is at a safe distance from both current carrying brackets,

it is not equidistant from said brackets, the

switch mechanism comprisin purpose of which is to give a` direct pull of the operating mechanism upon the switch mechanism and to provide a rigid stop that will limit the movement of the operating bar and consequently the pull upon the switch mechanism, as will presently be more fully explained.

. 32 denotes the operating bar which is pivoted to the insulating operating member, as at 33. I have shown the intermediate plate of the operating member as shortened and the operating bar as pivoted between the upper and lower insulating plates.

34 denotes a hub which passes through the insulating lining and the screw shell and is carried by-a bracket 35 which is secured to the upper and lower insulating blocks. The operating bar passes freely through the hub without contact therewith in operation and the outer end thereof is connected as by means of an eye 37 with suitable operating mechanism, as for example an operating lever 38 pivoted exteriorly of the shell to which a pendant 39 is attached.

It is not thought necessary for the pur- .pose of this specification to describe the operating mechanism in detail, as specifically it forms no port-ion of the present invention but, is described and claimed in another application for Letters Patent.

Another important feature of the present invention is that the operating bar is provided with shoulders 36 which are adapted to engage bracket 35, as clearly shown in Fig. 5, to limit the outward movement of the operating bar and consequently the pull upon the switch mechanism. This construction wholly prevents shocks to the switch mechanism and provides that the shocks of vigorous pulls upon the operating mecha nism be taken up by a rigid member which -Y cannot be harmed thereby.

Having thus described my invention, I claim: y

1. An insulating operating member of the character described, comprising upper, lower and intermediate insulating plates, said intermediate plate being shortened and a metal plate havin pass through the insu ating plate and secure the parts together. v 1

2. In a pull socket the combination with an insulating operating member, of operating mechanism and an operating bar pivoted to the operating `member and connected to the operating mechanism.

3. In a pull'socket the comblnation with integral lugs which switch mechanism comprising an insulating operating member, of operating mechanism, an operating bar intermediate the operatm member and the operating mechamsm an means for limiting the outward movement of the operating bar whereby Switch' mechanismis prevented injury to the 4. In the pull socket'the combination with insulating blocks, switch mechanism and operating mechanism, of an operating bar intermediate the Switch mechanism and the operating mechanism and provided with a shoulder, and a bracket connected to the insulating blocks through which the bar passes, the shoulder on said bar being adapted to engage the nbracket to limit the outward movement of the bar and prevent injury to the switch mechanism.

5. In a pull socket the combination with insulating blocks, operating mechanism and switch mechanism placed eccentrically to said blocks and on the far side from the operating mechanism, of an insulating operating member for the switch mechanism.

and an operating bar intermediate said operating member andthe operating mechanism.

6. In a pull socket the combination with insulating blocks, operating mechanism and switch mechanism placed Aeccentrically to said blocks and on the far side from the operating mechanism, of an insulating operating member for the switch mechanism, an operating bar intermediate the operating member and the Operating mechanism and provided with a shoulder and a bracket con-l nected to` the insulating blocks through which the operating bar passes and which is adapted to be engaged by the shoulder, substantially as described, for the purpose'specil through which said bar passes and which is adapted to be engaged by said shoulder whereby injur)T l`to the switch is prevented.'

8. A socket of the character described comprising insulating blocks, operating mechanism, switch mechanism placed eccentrically to said blocks and on the far side from the operating mechanism, an insulating operating member, an operating bar in,

termediate said member and the operating mechanism and meansfor limiting the outward movement of the operating bar.

In testimony whereof Ilaflix my signature in presence of two witnesses.

HARVEY HUBBELL.

Witnesses:

S. W. ATHERTON, H.- W. MEADE. 

